CMDs for stars in the field SL 435 (LMC 5_5): the observed CMD for the stars distributed within the cluster radius (top left panel); a field CMD for an annulus centred on the cluster, with an internal radius 3 times the cluster radius and an area equal to that of the cluster area (top right panel); the cleaned cluster CMD (bottom left). We overplotted box-shaped cells for each star in the field CMD to be used in the cluster CMD field decontamination (see section 4 for details). Colour-scaled symbols represent stars that statistically belong to the field (P ≤ 25%, pink), stars that might belong either to the field or to the cluster (P = 50%, light blue), and stars that predominantly populate the cluster region (P ≥ 75%, dark blue). Three isochrones from Marigo et al. (2008) for log (t/yr), log (t/yr) ± 0.1, and metallicity values listed in Table 1 are also superimposed. The schematic chart centred on the cluster for a circle of radius 3 times the cluster radius is shown in the bottom right panel. The black circle represents the adopted cluster radius. Symbols are as in the bottom left panel and with a size proportional to the brightness of the star. North is upwards, and east is to the left.